Filter



Pat'anted Feb. 7, I899. J. F. THEURER.

no. muss.

F ILTEB.

(Application filed Dec. 81, 1897.\

(No Modal.)

NORRIS Fzrslis co., PHOTO-LINK)" WASNXNGTOH,

UNITED STATES PATENT ()FFICE.

JACOB F. THEURER, OF MILWAUKEE, WISCONSIN.

FILTER.

SPECIFICATION forming part of Letters Patent No. 618,965, dated February7, 1899.

Application filed December 31,1897. Serial No. 665,044. (No model.)

' To all whom it may concern.-

Be it known that I, JACOB F. THEURER, a

citizen of the United States, residing at Mil-- waukee,in the county ofMilwaukee and State of Wisconsin, have invented certain new and usefulImprovements in Filters, of which the following is a specification.

My present invention pertains to filters,and has reference moreparticularly to the construction of the filter elements designed to beused in the so-called battery filters.

The invention is illustrated in the annexed drawings, wherein- Figure 1is a transverse sectional view of one of the elements after the pulp orfiltering material has been compressed therein; Fig. 2, a similar Viewshowing the completed element, and Fig. 3 an enlarged detail view. 1

The object of my present invention is to so construct and treat thefiltering element that there will be no seepage or leakage of the fluidby or around the abutting edges or faces of the filtering mass and itsretaining or holding frame.

In the drawings I have represented the retaining or holding frame in theform of a pan comprising a bottom A, havingan upstanding rim B and acentral hollow boss 0, slightly reduced at its lower end, as shown. Thebottom of the pan inclines from the rim to the boss and is provided orformed with a series of ribs D, the upper edges of which preferably liein a horizontal plane. Openings E are formed in the boss, extendingtherethrough and opening intermediate the ribs.

The inclined bottom of the pan does not lead directly up to the innerwall of the rim, but instead there is formed an inwardly-projectingshoulder F, formed by the upright wall G and the horizontal wall H. Afiat bearing-face I is provided intermediate the bottom of the pan andthe upright face G of the shoulder. There is also formed around thecentral hub or boss a shoulder J, defined by the horizontal face K andupright face L. A fiat or horizontal face M, similar to the face I, isalso provided, said faces preferably lying in the same horizontal plane.

In building up the filtering-body I first place a perforate disk ofmetal N within the pan, the disk being of such dimensions that it bearssquarely upon the faces I and M..

Upon this disk there is placed a disk of wire-- gauze 0, preferablysupported at its edges by strengthening-bands P, the combined thicknessof said bands, gauze disk, and perforate plate N approximating theheight of the upright walls L and M, so that the strengthening-bands liein the same plane as the faces K and H. When these parts are in place,the mass of pulp Q, of the requisite amount and consistency, is placedwithin the pan upon the disks. Pressure is then applied to the upperface of the pulp and it is condensed to the degree shown in Fig. 1, thebody being homogeneous and of a like density throughout. It will benoted upon reference to said figure and also to Fig. 2 that the lowerface of the mass near its outer and inner edges rests, respectively,directly upon the horizontal faces II and K and extends beyond the rimsor bands P. When the mass has been given that pressure which fits it toact as a filtering medium and which reduces its bulk so that it liesbelow the top.

of the rim B and boss 0 a gauze disk R,

having depending rims or bands S at its edges, is then placed upon theupper face of the body of compressed pulp. These bands are preferablycurved upon their under face and are designed to be forced down into thebody of the pulp overthe faces H and K, respectively. The mass havingalready been compressed the action of the rims is to condense thatportion of the pulp which isimmediately below and also slightly to eachside, as indicated by the shaded sections T. It not only condenses thepulp in a direct line, but it also tends to force the particles againstthe hub and the rim B, thereby forming a closer union between the edgeof the filtering-body and its retaining-frame. An upper perforate metaldisk U is then placed over the gauze disk, or said disk U may be placedthereon before the rims or bands S are forced down into the mass.

Any suitable frame for holding the filtering mass may of course beemployed and the form shown is merely for the purpose of illustration.So, too, the lower and upper perforate metal disks may perhaps undersome circumstances be dispensed with, and hence I do not desire to beunderstood as limiting myself thereto.

In practice a series of these filtering elements are employed; but ofcourse one alone may be used. The object of the construction is,however, the same under both circumstances-that is, the seepage of theunfiltered liquid around the edges of the filtering-body is prevented.Ordinarily the liquid passes from the upper face to the lower, andnaturally it will pass through that portion which is not condensed. 'Itis precluded from passing around the edges of the mass by reason of theclose contact of the parts, and, furthermore, the route which the liquidwould have to travel is so circuitous, owing to the break-joint formedby the shoulders F and J, that all danger from this source is done awaywith.

Having thus described my invention, what I claim is- 1. A filteringelement. comprising a frame or support; a mass of compressed pulp heldtherein; and rims or rings forced into said previously-compressed pulpnear its edges, substantially as described whereby a second compressionis exerted upon that portion of the pulp beneath the rims or rings.

2. A filtering element comprising a frame or support; a mass ofcompressed pulp held therein; and a body forced down into saidpreviously-compressed pulp near its edge, whereby said compressed pulpis further condensed and forced against its support.

3. The method of forming filtering elements which consists in placing amass of pulp within a support, compressing the same overits entiresurface, and finally condensing the compressed pulp around its edgeswhere it contacts with the support.

4. The method of forming filtering elements which consists in placing amass of pulp within a support, compressing the same over its entiresurface, and finally forcing a body into the mass near its edge, wherebythe edge is condensed and forced outward against the support,substantially as described.

5. In combination with a pan having an upstanding edge and a centralboss; a mass of pulp compressed therein; and rims forced down into saidmass near the boss and rim, whereby the mass is condensed at suchpoints, substantially as described.

6. In combination with a pan having an upstanding edge and a centralboss; shoulders extending in from said rim and boss; a perforatesupportresting within the pan below said shoulders; a mass of pulp compressedupon said support and having its edges extending over and upon saidshoulders; and

rims embedded in the upper face of the mass over the shoulders.

7. In combination with a pan having an upstanding edge and a centralboss; shoulders extending in from said boss and rim; a perforate diskmounted Within the pan below the shoulders; a mass of pulp compressedupon said disk and extending over the shoulders;

and an upper disk, having depending rings or rims at its edges forceddown upon the upper face of the mass.

8. In combination with a pan having an upstanding rim and a centralboss, the bottom of the pan inclining downwardly from the rim to theboss; shoulders projecting in from said rim and boss; perforate disk Nand wire disk 0, placed within the pan below the upper face of saidshoulders; a mass of pulp compressed upon said disks; a wire disk havingdepending rims Sforced down upon said com-' pressed mass; and aperforate disk placed upon said wire disk.

In witness whereof I hereunto set my hand in the presence of twowitnesses.

JACOB F. THEURER.

Witnesses:

C. W. I'IENNING, H. C. GoErz.

